754 EXPERIMENT STATION RECORD. [Vol.41 



Absence of complement in the blood of insects. A. C. Hollanue (Compt. 

 Rend. Soc. Biol. [Paris]. 82 (1919), No. 6. pp. 21S-220).— In investigations con- 

 ducted the author failed to find complement present in the blood of a number 

 of insects, including Vanessa nrticee, V. io, Bomhyr ruhi. Chelonin caja, 

 Sphinx lif/ustri, Decticus verrucivorus, Orphania denticauflata, and Ephippiger 

 terrestris. 



Guide to the collection and preservation of insects, I. de Sagarka {Mus. 

 Barcinonensis Sei. Not. [Mus. Cienc. Xat. Barcelona] Opera, Ser. Zool., No. 4 

 (191S). pp. 99. figs. 65). — Tliis is intended as an aid to the young entomologist. 



On the absence of insect pests in certain localities and on certain plants, 

 T. D. A. CocKEKELL (Jovv. Econ. Ent.. 12 {WIS), No. 4. pp. 345-347) .—The 

 author records observations of the occurrence of garden insects at Boulder, 

 Colo., in 1918. 



On some phases of insect control by the biological method, H. S. Smith 

 {■lour. Econ. Ent., 12 {1919), No. 4, pp. 288-292). — This is a discussion, based 

 upon work of the California State Commission of Horticulture, in which the 

 author considers the more important factors which govern control by entomo- 

 phagous insects. 



Effect of excessive sterilization measures on the germination of seeds, E. R. 

 DE Ong {Jour. Econ. Ent., 12 {1919), No. 4. pp. 5^3-345 ) .—Experiments con- 

 ducted with a view to determining the germination percentage of beans after 

 treatment witli excessive heat and excessive dosage of potassium of cyanid and 

 carbon disulphid are reported in tabular form. It is shown that fumigation 

 and heat sterilization are safe practices both for grains and legumes at the 

 dosages commonly used, with proper precautious as to the length of exposure 

 and ventilation afterwards. 



The stratification of liquid hydrocyanic acid as related to orchard fumiga- 

 tion, R. S. WoGLUM and M. B. Rounds {Jour. Econ. Ent, 12 {1919), No. 4j PP- 

 800-303, pi. 1). — The authors found that in each of the 11 experiments con- 

 ducted where the liquids were brought together slowly sti'atification occurred 

 regardless of whether the water was added to the hydrocyanic acid or the 

 hydrocyanic acid to the water. If, however, tlie materials were brought together 

 violently and thoroughly sliaken stratification was not produced. 



The strength of nicotin solutions, Y. I. Safro {Jour. Econ. Ent., 12 {1919), 

 No. 4i PP- 349-351). — The author calls attention to the fact that neither odor 

 nor color is an indication of the comparative strength of nicotin solutions. A 

 statement of the percentage of nicotin content alone is insufficient as indicating 

 its exact strength. " The nicotin may be in the form of ' free ' nicotin or in the 

 form of nicotin sulphate, but the pei-centage refers to the amount of nicotin, 

 by weight, because it is the only method of knowing definitely how much actual 

 nicotin is contained in the solution, and such designation is required by the 

 Federal Insecticide Board. It is necessary, then, to know the specific gravity 

 of the preparation in order to knov,' the actual nicotin content." 



The value of molasses and sirups in poisoned baits for grasshoppers and 

 cutworms, A. W. Morriix {Jour. Econ. Ent., 12 {1919), No. 4, pp. 337-343).— 

 The author concludes that molasses or sirup of any kind is absolutely unneces- 

 sary as an ingredient of poisoned baits against many of the common cutworms. 

 The addition of molasses, however, increa.ses the attractiveness of the bait for 

 some species under certain conditions. Evidence has also accumulated to the 

 effect that the use of molasses or sirup is unnecessary in combating some 

 species of grasshoppers. 



Report of the State entomologist and plant pathologist {Tenn. Bien. Rpt. 

 Dept. Agr., 1917-18, pp. 53-72, fig. 1), — This report includes u discussion of the 



