Caption: "Spraying cabbage field with improved double-pipe sprayer." RF photo #21224u.

Caption: "The double-pipe sprayer improved by the Bureau in cooperation with the Central Cotton Improvement Institute." RF photo #21224t.

Caption: "The semi-automatic sprayer improved by the Bureau in cooperation with the Central Cotton Improvement Institute." RF photo #21224s.

Caption: "A staff member constructing a sprayer improved by this bureau in cooperation with the Central Cotton Improvement Institute." RF photo #21224r.

Caption: "Pine caterpillar control campaign on Purple Mountain. Soldiers of General Chiang Kai-shek cooperated in this campaign under the direction of entomologists of the bureau." RF photo #21224q.

Caption: "Pine caterpillar control campaign on Purple Mountain. Soldiers of General Chiang Kai-shek cooperated in this campaign under the direction of entomologists of the bureau." RF photo #21224p.

Caption: "Dorsal, lateral, and abdominal views of the pine caterpillar." RF photo #21224m.

Caption: "Spraying of cotton oil emulsion for the control of the cotton aphis." RF photo #21224l.

Caption: "Spraying of lead arsenate and calcium arsenate in experimenting with the control of the cotton leaf roller." RF photo #21224k.

Caption: "Defoliated cotton plants injured by the cotton leaf roller." RF photo #21224j.

Caption: "Spraying of lime-sulphur and nicotine sulphate as a treatment for the control of the cattle lice on buffalo." RF photo #21224h.

Caption: "Spraying of lime-sulphur and nicotine sulphate as a treatment for the control of the cattle lice on buffalo." RF photo #21224g.

Caption: "A watermelon saved from injury by the watermelon aphis after a treatment of pyrethrum-kerosene emulsion." RF photo #21224f.

Caption: "Bureau representatives instructing farmers in the application of pyrethrum-kerosene emulsion for the control of the watermelon aphids." RF photo #21224e.

Caption: "Applying a native insecticide to determine effectiveness." RF photo #21224d.

Caption: "Experiment with native insecticides to determine effectiveness in controlling the cabbage leaf beetle." RF photo #21224c.

Caption: "Flowers and leaves of Roy-Kung-Teng, used for insecticides." RF photo #21224b.

Caption: "Leaves and fruit of the bitter tree. The Bureau discovered the effectiveness of this native plant in preparing insecticides." RF photo #21224a.

Caption: "Placin tobacco stems beside rice plants in experimenting with the control of the rice borer." RF photo #21224i.

Caption: "Pine caterpillar control campaign on Purple Mountain. Soldiers of General Chiang Kai-shek cooperated in this campaign under the direction of entomologists of the bureau." RF photo #21224o.