292 STATE BOARD OF AGRICULTURE. 



Pittsburgh, ]*a., the U. S. Department of Agriculture, and the Experi- 

 ment Stations of Michigan, Indiana and Wisconsin. The Heinz Com- 

 pany established Heinz Industrial Fellowships at this institution and at 

 Purdue University and the University of Wisconsin, paying the salary 

 of one graduate student at each institution and his field expenses during 

 the summer. These students were assigned different diseases of the cu- 

 cund)er for investigation, these being their major graduate subjects. 

 Their summers are spent at field stations in their respective states where 

 their whole time is devoted to their major problems from their practical 

 aspects as well as from the laboratory standpoint. The Bureau of Plant 

 Industry of the U. S. Department of Agriculture is represented by Mr. 

 AY. W. Gilbert, who has had general charge of the work and has at- 

 tempted to so coordinate the investigations that there should be as little 

 duplication of work as possible. One field man was also provided for 

 each field station to do spraying, take records, etc. The fields and build- 

 ings for the field stations and the labor and fertilizers connected there- 

 with were furnished by the Heinz Company. The laboratory equipment 

 for the Michigan field station situated at Big Kapids, was loaned by the 

 Botanical Division of this Station. I had charge of the Avork of the 

 Industrial Fellow assigned to Michigan, planning and overseeing his 

 work at the College and also at the field station. Mr. S. P. Doolittle be- 

 gan as our Industrial Fellow in May, 1914, on an agreement between the 

 Heinz Pickle Company and this Experiment Station and College, a year 

 before similar fellowships were established at Indiana and Wisconsin 

 or the U. S. Department of Agriculture became a party to the agree- 

 ment. He was stationed at Hamilton for that season, beginning Avork 

 on the disease since known as Cucumber Mosaic, as well as on Cucum- 

 ber Scab. He continued the work on these two diseases during fhe en- 

 suing College year, receiving his M. S. degree in June, 1915, with a the- 

 sis entitled "Cucumber Scab caused by Cladosporium cucumerinum." 

 This was published in the 1915 Report of the Michigan Academy of 

 Science. The field laboratory in 1915 and 1916 was located at Big 

 Rapids. These two summers and the intervening college year Mr. Doo- 

 little devoted to an intensive study of the mosaic, which he demonstrated 

 to be a communicable disease, carried by several kinds of insects, by the 

 hands of the pickers, and by any means which would break the cells of 

 a diseased plant so as to permit the escape of the juices and allow them 

 to reach a similar break on a healthy plant. He also showed that squash, 

 muskmelon and other members of the family Avere subject to the same 

 disease and that it could be transmitted from one to the other by the 

 means mentioned above. No causal organism could be demonstrated 

 and the juices were found to be still infectious even after filtering 

 through certain grades of porcelain (bacteriological) filters, demon- 

 strating that the organism that causes the disease, if there be one, is ex- 

 tremely minute. The disease is one of a great class of little understood 

 diseases of which the mosaic of tobacco has been given a great deal of 

 study. Other diseases apparently closely related to it are peach yel- 

 lows and little peach, mosaic of potato, of bean, of raspberry, etc. In 

 the April, 1916, number of the periodical Phytopathology Mr. Doolittle 

 published a short note upon the results of his cucumber mosaic work. 

 At the close of the summer of 1916 Mr. Doolittle decided to go to the 

 University of Wisconsin to complete his work for the degree Ph. D. The 

 fellowship at that institution having become vacant, the Heinz Com- 



