282 



2. Reproduction is provided for through conidia and ascospores : The former 

 ephemeral, the latter long-lived. 



3. The ascospores germinate within the ascus and perithecium, and their 

 mycelium, growing through the mouth of the perithecium, rapidly produces 

 numercvis conidia, capable of infecting the strawberry. There seems to be 

 proof that no infections take place directly from the germinating ascospore. 



4. The only mode now kufn^n cf infecting the new leaves of the host plant is 

 through the conidia, which grow from the mycelium about the white spots, 

 from that of the sclerotia, and from that produced by the ascospore. Conse- 

 quently the conidia, or the spotted leaves themselves, must be destroyed in 

 order to insure immunity against disease. 



5. The mycelium does not descend to the stem or roots through the leaf- 

 stalks and pass the winter there. Therefore destruction of the leaves in the 

 fall or spring destroys the fungus. 



6. Aside from care in the selection of soil and in good cultivation two modes 

 of treatment will be found to repay the fruit grower : First, if the season opens 

 unfavorably, the regular use of the fungicides recommended (sulphide of potas- 

 sium, 1 ounce to 8 gallons of water, or carbonate of copper dissolved in one 

 quart of water and diluted to 20 gallons) ; second, if the fungus persists till 

 autunm, destruction in the following spring of all old leaves by burning over. 



ASCOCHYTA FRAGARLE, SaCC, W. R. DuDLEY, M. S. (pp. 182, 183). 



A brief account of some preliminary investigations of a disease of the 

 strawberry thought to be due to this fungus. 



BULLETIN No. 15, DECEMBER, 1889. 



Miscellaneous analyses, 1880, ^y. P. Cutter, B. S. (pp. 18T, 

 188). — These inckide chemical analyses of ashes, cotton-seed-hull 

 ashes, malt sprouts, cotton-seed hulls, '* corn germ " (refuse from a 

 starch factory), Avheat bran (new process), " Condimental Cattle 

 Food " (wheat hvan or shorts mixed with a small quantity of salt and 

 some aromatic plant), and soot. 



Studies in botany, A. X. Prentiss. ]\[. S. (pp. 189-192). 



(1) Notes on meadow-grasses (pp. 189, 190).— Brief notes on ex- 

 periments with Kentucky blue-grass {Poa pratensis) ,wire-gras?, (Poa 

 compressa), fowl meadow-grass (Poa serotina), rough meadow-grass 

 {Poa. trioialis), wood meadow-grass (Poa ne?noraUs), and water 

 meadow-grass (Poa aquatica). ''The notes indicate the great diffi- 

 culty of obtaining a satisfactory seeding with commercial gTass seed, 

 especially as regards those kinds less generally in use." 



(2) On root propagation of Canada thistle (pp. 190, 191). — A 

 brief preliminary report of a pot experiment with cuttings from 1 

 to one-sixteenth inch in length. The results thus far obtained seem to 

 indicate that while minute portions of the root are not likely to grow, 

 pieces longer than one- fourth of an inch will grow freely. 



(3) On the vitality of %i:eed seeds (pp. 191, 192). — Of thirty-two 

 varieties collected in 1879 and kept under conditions unfavorable to 

 the preservation of Adtality, ten germinated in 1889 when sown in 

 boxes in a greenhouse where the conditions were probably not so 

 favorable for germination as in an out-of-door seed bed. 



