ECONOMIC ZOOLOGY ENTOMOLOGY. 663 



" When we compare the behavior of T. lewisi in the four invertebrate hosts 

 studied here, we see that the most complete cycle takes place in the flea, 

 where forms are produced which are never found in cultures. In the louse 

 the development may be truly described as a natural culture ; in the bug, the 

 development (as far as we could judge by our incomplete experiment) does 

 not even produce all the cultural forms (only the crithidiae) ; and last, in 

 the tick the trypanosomes do not develop at all but are only preserved for 

 some time." 



Trypanosoma vespertilionis, R. Gonder (Centbl. Bakt. [etc.], 1. Aht., Orig. 

 53 {1910), No. 3, pp. 293-302, pis. 2, fig. 1; abs. in Sleeping Sickness Bur. 

 [London] Bui., 2 {1910), No. 15, pp. 90, 91). — T. vespertilUmis was found in 

 about one-fourth of some 400 bats, representing 7 species, that were examined 

 in southern Italy and Istria. 



Chemical investigation of best conditions for making' the lime-sulphur 

 wash, L. L. Van Slyke, A. W. Bosworth, and C. C. Hedges {New York State 

 Sta. Bui. 329, pp. 405--'/. 'i9). — The work here described, which is a continuation 

 of the investigations published in Bulletin 319 previously noted (E. S. K., 22, 

 p. GGO), has had for its general object a study of the conditions that make it 

 possible to utilize the lime and sulphur most completely. The more important 

 points studied include the conditions under which it is possible to get the 

 largest amount of lime and sulphur most completely into soluble combination ; 

 the conditions under which it is jxtssible to produce a lime-sulphur solution 

 containing the largest amount of calcium pentasulphid (CaS5) ; the efllect of 

 concentration of the lime-sulphur solution by evaporation at boiling tempera- 

 ture; some of the chemical changes occurring in the making of lime-sulphur 

 solutions; the condition favorable to the formation of sediment in lime-sulphur 

 solutions; the efficiency of lime-sulphur solutions in relation to chemical com- 

 position; the keeping power of lime-sulphur solutions on standing; analyses 

 of crystals formed in concentrated lime-sulphur solutions ; the relation of 

 density of solutions to percentage of sulphur as a basis for dilution ; the 

 efficiency of different formulas ; and a method for the approximate determina- 

 tion of impurities in commercial lime. 



"As a result of the investigation embodied in this bulletin, the following 

 proportions are recommended for making lime-sulphur solutions : Thirty-six 

 lbs. of lime (based on pure lime, CaO), 80 lbs. of high-grade, finely divided 

 sulphur, and 50 gal. of water. When lime containing 95 per cent or less than 

 95 per cent of calcium oxid is used, more than 30 lbs. must be taken, according 

 to amount of impurities (38 lbs. for 95 per cent lime and 40 lbs. for 90 per cent 

 lime), but no lime should be used containing less than 90 per cent of calcium 

 oxid or more than 5 per cent of magnesium oxid. In boiling the solution, the 

 liquid must not be allowed to drop more than slightly below the 50 gal. level." 

 A method recommended for the approximate determination of impurities in 

 lime is based upon the fact that when 1 part of pure lime and 2 parts of sul- 

 phur are boiled with plenty of water for 1 hour, only slight amounts of sediment 

 appear. If the lime contains impurities, these appear as sediment, the amount 

 of sediment being an approximate measure of the amount of impurities. 



Experiments with homemade concentrated lime-sulphur mixtures, P. J. 

 Parrott and W. J. Schoene {New York State Sta. Bui. 330, pp. Jf5J-'t8.'i, fig. 

 1). — "This bulletin deals with the use of homemade concentrated lime-sulphur 

 mixtures in various station experiments during the past 3 years and in 17 

 volunteer experiments conducted during 1910. 



"In the station experiments of 1910 the densities of the clear solution in 21 

 preparations varied from 22 to 31° B., giving an average of 26^° B. The sedi- 

 ment in 8 samples that were analyzed ranged in quantities from 2.9 lbs. to 



