580 EXPERIMENT STATION RECORD. [Vol.38 



either method is much greater than that ordinarily employed in making counts 

 in laboratories where large numbers of routine analyses are made. 



" In making comparative counts with the plate and microscopic methods, the 

 agar plate counts will normally be larger than tlie counts of groups of bacteria 

 by the microscopic method and smaller than the count of individual bacteria; 

 but many things may change this relationship in individual cases. Among 

 these things are inaccuracies in the counts due to exceptionally irregular dis- 

 tribution, the presence of dead bacteria, or of living bacteria incapable of 

 growth on the agar used. Where a milk contains nothing but living bacteria 

 occurring singly (or at least with only a relatively small number of groups 

 containing two or more individuals), all of which are capable of growth on 

 the agar used, very consistent counts can be made by either method from 

 duplicate samples by the same or by different persons. In such cases the 

 relation between the counts is such as to leave little doubt but that the figures 

 obtained are remarkably accurate counts of the number of groups of bacteria 

 in the case of both the microscopic and plate methods; or of the number of 

 bacteria present in the case of the microscopic method." 



Buttermaking- on the farm, G. H. Barb {Canada Dept. Agr., Dairy and Cold 

 Storage Branch Bui. 53 (1917), pp. 16, figs. 11). — Brief directions are given for 

 making butter on the farm. 



Home cheese making, V. E. Scott (Agr. Ext. Univ. Nev. Bui. 15 {1911), pp. 

 8, figs. 5). — Simple directions are given for the home manufacture of a number 

 of common cheeses. 



VETERmABY MEDICINE. 



Public health and medicine, W. C. Goegas {Proc. 2. Pan Amer. Sci. Cong., 

 1915-16, vols. 9, pp. XV+714, pis. 2, figs. 35; 10, pp. Xr+652, j)ls. 7, figs. 24).— 

 Among the papers hei-e presented relating to diseases and the transmission of 

 disease by insects mention may be made of the following: In volume 9, Insect- 

 Borne Diseases in Pan America, by J. Guiteras (pp. 9-41) (E. S. R., 34, p. 754) ; 

 Filariasis in the Americas, by A. J. Smith (pp. 49-76) ; Present Views in Re- 

 spect to Modes and Periods of Infection in Tuberculosis, by M. P. Ravenel (pp. 

 85-95) (E. S. R., 35, p. 281) ; Carlos Pinlay on the Hou.'^e Mosquitos of Havana, 

 by F. Knab (pp. 107-110) ; and in volume 10, Concerning the Chemical Nature 

 of the Vitamins, by R. R. Williams (pp. 39-48) ; Specific Parenteral Digestion 

 and Its Relation to the Phenomena of Immunity and Anaphylaxis, by J. Bron- 

 fenbrenner (pp. 278-287) ; The Mechanism and Clinical Significance of Anaphy- 

 lactic and Pseudoanaphylactic Skin Reactions, by J. A. Kolmer (pp. 287-304) ; 

 Anaphylatoxin and the Mechanism of Anaphylaxis, by R. Weil (pp. 308-315) ; 

 General Problems and Tendencies in Cancer Research, by L. Loeb (pp. 347- 

 354) ; Factors in Immunity t>o Cancer, by J. B. Murphy and J. J. Morton (pp. 

 360-362) ; Immunity to Transplantable Neoplasms, by W. H. Woglom (pp. 

 362-365) ; Tumor Immunity, by E. E. Tyzzer (pp. 365-382) ; General Biology 

 of the Protozoan Life Cycle, by G. N. Calkins (pp. 529-536) ; Parasitology of 

 Certain Animals of Paraguay, by L. E. Migone (pp. 573-576) ; On the Inhibi- 

 tory Properties of Magnesium Sulphate and Their Therapeutic Application in 

 Tetanus, by S. J. Meltzer (pp. 007-615) (E. S. R., 35, p. 75) ; Observations on 

 Tropical Parasites, by R. Gonzaiez-Rincones (pp. 615-618) ; and Antirabic Vac- 

 cination in Havana with Statistics Compared with Those of Other Nations, by 

 J. Santos Fernandez (pp. 635-637), 



Practical veterinary pharmacology and therapeutics, H. J. Mh-ks (Neto 

 Yark: The Macmillan Co., 1917, pp. [10]+519, pis. 3, figs. 19).— This work is 



