350 EXPERIMENT STATION RECORD. [Vol.40 



Some new or little known hosts for wood-destroying fungi, II, A. S. 

 Rhoads (Phytopathology, 8 (1918), Xo. 4. pp. 164-167). — In a previous article 

 (E. S. R., 37, p. 846), the author recorded a number of unusual hosts for fungi 

 usually confined to species of coniferous or dicotyledonous wood. In the present 

 paper additional species of fungi on unreported hosts are cited. 



Note upon the hydrogen-ion concentration necessary to inhibit the growth 

 of four wood-destroying fungi, M. R. Meachau {Science, n. ter., -}S (1918), 

 No. 1246, pp. 499, 500, fig. 1). — Due to the lack of definite information regarding 

 the behavior of fungi toward varying degrees of hydrogen-ion concentration, the 

 author conducted experiments with four v. troying fungi, Lcnzites 



sepiaria, Forties roseus, Coniophora ccrebclla, and ilcrulius lacrynums, the data 

 obtained being presented in the present paper. 



It appears that growth was not inhibited until a high hydrogen-ion concen- 

 tration was reached, and that the four organisms responded In about the same 

 way, though there were distinct variations among thorn. The most Important 

 facts regarding response to concentration are shown in the form of eur\ 

 Translating the data into terms of normality, the author states that the first 

 critical point occurs at about N/350, and the limiting acidity at about N/50, 

 hydrogen-ion concentration. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Control of ground squirrels by the fumigation method, G. R. Stewabt and 

 J. S. Bvni) (California Sta. Bui. 80S {1918) '.',. tigs. 5).— Following a 



general discussion of carbon blsulphld as b fumigant, the authors report upon 

 experiments with varying concentrations of the gas, the flow of the gas uphill, 

 tests with other gases, and field fumigation. 



The experiments clearly show that carbon biSUlphid is an eminently satis- 

 factory fumigant for ground squirrels. Twenty to SO minutes' treatment with 

 air containing 1! per cent of carbon bisulphid is sure to be fatal. The dosage of 

 1.5 to 2 oz. usual in the waste ball method corresponds to about 2 per cent gas 

 in large burrows. Experiments with the artificial burrow, as well as Dixon's 

 field observations in the San Joaquin Valley (B, s. K.. 38, p. 456), demonstrated 

 that the gas will not flow over elevations of 1 or - ft and that exploding the 

 gas will distribute it somewhat more but not sufficiently to make it rise over the 

 usual irregularities. The results indicate that some form of apparatus to pump 

 the lt:is is desirable and it appears that all that i --:ir\ i- a bellows or 



large-bored pump which will blow a strong 3l of air through the tank which 



contains liquid carbon bisulphid. 



Observations show thai neither gasoline nor distillate are satisfactory ma- 

 terials for squirrel fumigation. 



A list of 10 references to the literature is appended. 



Laws relating to fur-bearing animals, 1918, D. E. Lantz (V. 8. 1>< pi. \ar.. 

 Farmers' Bui. 1022 {1918), pp. SI).— This is the annual summary of laws in the 

 United States, Canada, and Newfoundland relating to trapping, open seasons, 

 propagation, and bounties. 



Wild animals [of the Yellowstone National Park], V. BAILEY ( I'. s. Dept. 

 Int.. Gen. inform. Yellowstone Nat. Park, 1917, pp. -}J-o-}; 1918, pp. Si 60).— 

 Brief accounts are given, under their respective orders, of the occurrence, 

 numbers, and habitats of the wild animals found within the park. 



Mutanda ornithologica, IV, H. C. OkeRHOLSKB (Proc. Biol. Soc. Wash., fit 

 {1918), pp. 125, 126). — A continuation of the author's comments on the nomeu- 

 Clatorial alterations in the names of l>ir I 39, p. »'• 



