2. Jones, L. R. (a) Lettuce mildew and lettuce rot. Rept. Vt. Exp. Sta, 



5: 141. 1892. (d) Lettuce rots. Rept. Vt. Exp. Sta. 6: 84. 1893. 



3. Taft, L. R. Lettuce mildew. Am. Gard. 15 : 375. 1894. 



4. Galloway, B. T. The growth of lettuce as affected by the physical 



properties of the soil. Agrl. Science 8 : 302. 1894. 



5. Pammel, L. H. Diseases of lettuce and radishes. Am. Gard. 16: 150. 



1895. 



6. Bailey, L. H. Lettuce. Bull. Cornell Univ. Exp. Sta. 96 : 3S7. 1S95. 



7. Halsted, B. U. Some of the more injurious fungi upon market- 



garden crops : Lettuce. Rept. N. J. Agrl. Coll. Exp. Sta. 7 : 349. 

 1895. 



S. Selby, a. D. Lettuce rot. Bull. Ohio Exp. Sta. 73 : 221. 1S96. 



9. Stone, G. E., and Smith, R. E. (a) " Drop " of lettuce. Rept. Hatch 

 Exp. Sta. Mass. Agrl. Coll., 9 : 79. 1897. (i) The "drop " of let- 

 tuce. Rept. Hatch Exp. Sta. Mass. Agrl. Coll. 10 : 55. 1898. 

 (6") Further considerations in regard to the "drop" in lettuce. 

 Rept. Hatch Exp. Sta. Mass. Agrl. Coll. 11 : 149. 1899. 



ID. Kinney, L. F. Garden lettuce and its cultivation. Rept. R. L Exp. 

 Sta. 10 : 270. 1S98. 



11. Garman, H. A method of avoiding lettuce rot. Bull. Ky. Exp. Sta- 



81 : 3. 1899. 



12. White, F. H. Notes on Heart-Rot of Lettuce. Am. Gard. 21 : 4S6. 



1900. 



It has just been said that lettuce is a plant very sensitive to 

 improper conditions and treatment. The effects of such circum- 

 stances may be simply a poor development, but often more serious 

 results occur and the plant falls a prey to disease which brings 

 about its destruction. The diseases of lettuce have not been well 

 understood. A number have begn described and practical growers 

 distinguish several different forms, but very little definite knowledge 

 of the subject exists. The worst troubles with which Massachusetts 

 growers have to contend may be classed in general as rotting of the 

 crop, in various forms and at various stages of the growth of the 

 plant. That is, the plant is spoiled by a part or all of it decaying 

 before it reaches maturity. This may or may not kill the plant, 

 but in any event it is almost always spoiled for market. The nature 

 of the trouble of this sort varies a good deal in different cases and 

 many growers distinguish several forms of rotting by distinctive 

 names. It is generally believed and undoubtedly demonstrated in a 

 practical way that much of this rotting can be controlled by the 



