1066 EXPERIMENT STATION RECORD. 



the trees which had been thoroughly spraj-ed. A 25 per cent mechan- 

 ical mixture of kerosene did no damage to the trees, but some live 

 scales were found upon fruit and branches of the trees. The 20 per 

 cent mixture of crude petroleum caused no injury to peach, plum, or 

 apples and killed all scales with which it came in contact. Undiluted 

 crude petroleum was also employed on a small scale on Japanese plum 

 trees with good results and without injury to the tree. Undiluted 

 petroleum was tried in another localitj' with similar results, the trees 

 having been subsequently found entirely free from living scales. The 

 author states that the undiluted crude petroleum treatment gave the 

 best results of any method ^v hich was tried. 



The composition of arsenical insecticides, S. Avery {IdaJio Sta. 

 Bui. L^.7, i)2>. 11)- — Analyses were made of 11) samples of Paris green 

 obtained from dealers in different parts of the State. An average of 

 these samples showed copper oxid 30.49 per cent and arsenious acid 

 56.86 per cent, 3.35 percent of the latter being solu1)le. The author 

 estimates that 3 percent of commercial Paris green may ))e considered 

 as foreign substances and moisture, which are perhaps unavoidable. 

 The assumption that Paris green is insoluble in water is incorrect, since 

 55 per cent of the arsenic contents in a pure sample of Paris green 

 was extracted by means of distilled water alone. The author considers 

 the methods of solution in ammonia and passing Pai'is green over a 

 glass slide to be of some value in determining its quality, but recom- 

 mends as the only entirely satisfactory test a chemical analysis. 



Tests made on the samples of London purple indicated that consid- 

 erable lime was present in the form of the carbonate. Several samples 

 of Arsenoids were examined by the author, with especial reference to 

 the relative capacity of the bases which the}- contained to form insol- 

 uble compounds with arsenious acid. It was found that the tendency 

 of arsenite of lime to give oft' soluble arsenic is somewhat reduced by 

 increasing the excess of lime. Brief notes are also added on copper 

 arsenite, barium compounds, lead compounds, and home-made arsenite 

 of lime. 



The honeybee, R. Helms {Jour. Dept. Agr. West. Australia, 2 {1900), No. G, pp. 

 4OU-4IS). — The author calls attention to the great variety of plants in Australia 

 which yield nectar. A consideralile inniiber of tliese plants produce flowers over an 

 extended period. Another advantage for bee keepers in Australia is the mild 

 climate. 



The differentiation of cell elements in the ovary of the queen bee, W. 

 Paulcke {Zool. .Jahrb., Abt. Anat., U {1900), No. 2, pp. 177-202, pis. 4, Jig- -?)•— The 

 author gives an account of the generations of cell divisions in the ovaries of queen 

 bees with reference to the proportion and i)urpose of the nutritive (;ells and cells 

 which ultimately become eggs. The details of cell differentiation are described for 

 both varieties of cells. A bibliography of the subject is appended. 



Drone production, A. Gale {Ayr. Gaz. New South Wales, 11 {1900), No. 12, pp. 

 109.5-1098).— 1\\(\ author gives a popular discussion of the relationship of drones to 

 the rest of the colony and to the i)rol)lem of ])arthenogenesis in bees. 



