specific advice. The evening is devoted to a public meeting. The organization in charge does the necessary advertising, furnishes the hall and lantern if an evening lecture; otherwise enlarged photographs are used.

Insecticide Work.-Because of the change in the insecticide law the work of the laboratory was changed this year by the elimination of the greater part of the routine analysis and the concentration of the attention upon important problems, the most important of which has been the completion of the study of Phenolic insecticides and fungicides, a class of substances rarely recommended by entomologists and very extensively sold as proprietary articles.

A beginning was made in the revision of the methods of examination of insect powders, another group of preparations having large sale and without recognized standards. The number of routine analyses for the year was about two hundred, of which about 15 per cent were users' samples and a considerable number were those submitted by Horticultural Commissioners. This shows a remarkable increase in the popular recognition and use of the laboratory by growers.

A new policy was also adopted this year of deputizing the County Horticultural Commissioners, thus securing their co-operation in the enforcement of the law. The following commissioners have been appointed for this work the present year:

San Joaquin ........W. Garden........Rm. 10, Court House, Stockton.

FARM MECHANICS

BY

F. L. PETERSON

The large number of students enrolled in the courses in Farm Mechanics demanded the entire attention of the staff.

The division assisted in two traction engine demonstrations, one at Fresno and the other at West Sacramento, California. These demonstrations were conducted by "Orchard and Farm," but the technical questions were handled by this division. While this demonstration was staged by private enterprise, this division lent its assistance willingly.

Baker & Hamilton

LOANS TO THE DIVISION

Mowing machine, Buckeye, 5-foot cut, gear drive.

Sulky plow, P. & O., Success, 14-inch share.

Walking plow, P. & O., Scotch Clipper, 14-in.

California Engineering and Supply Co.

Gas engine, Ziegler Schryer, 4 H.P.

Centrifugal pump, type B with hand primer.
Fairbanks Morse & Co.-

Gas engine, horizontal, 10 H.P.

Gas engine, vertical, 4 H.P.

Stroke pump.

Electric motor, 10 H.P. and starter.

Holt Manufacturing Co.

Gas tractor, Caterpillar, 65 H.P., No. 2074.

Two Davis disc gang plows, 6 discs each, No. 294, 295.
International Harvester Co.-

Gas tractor, wheel type, 25 H.P.

Pacific Implement Co.

Walking plow, 12-in., South Bend.

Walking plow, 12-in., South Bend, black land.

Walking plow, 10-in., South Bend, vineyard.

The new oak-like walnut in center; on either side a typical California black walnut seedling; all from same cluster of normal nuts from a California black walnut tree. Apparently oak does not enter into the origin of this new form.

GENETICS

BY

E. B. BABCOCK

Instruction. The primary purpose in organizing this division was to provide instruction in the principles of breeding for sophomores in the College of Agriculture. Conforming to this plan, the writer's first attention has been given to the course for sophomores, with the result that a certain measure of success has been achieved.

During the past year eleven advanced undergraduate and three graduate students have worked on special topics in genetics and submitted reports or theses. The following topics among others have been studied: "Corn, Its Culture and Improvement, " "Carnation Breeding," 'Wheat Breeding in America," "Seed Selection and Breeding," "Pollen Germination in the Walnut," "Chromosome Counts for Certain Walnuts."

Research. The policy of this division is to have comparatively few projects and numerous minor investigations going forward.

Study of a New Variety of California Black Walnut.-Since 1907 the investigation of a new form Juglans californica Watson has been under way for the purpose of discovering the nature and origin of this form. The variety has been described and various hypotheses concerning its origin discussed in University of California Publications in Agricultural Sciences, Vol. 2, No. 1. Recent work on this problem has led to the following conclusions:

1. The belief, which has been generally held, that the new form J. californica var. quercina originated through hybridization between walnut and oak is not supported by our observations and results.

2. There is no evidence that hybridization with other species of walnut or cross pollination with other trees of the same species causes the appearance of the new form.

3. Abnormal, late appearing flowers and fruits occur rather frequently on the wild black walnuts, but they very seldom produce quercina seedlings and certainly are not the cause of the origin of the new variety.

4. The evidence that seedlings of the new variety do come from certain normal nuts is conclusive since a tree has been located that