624 Bulletin 348 



The bulletins that he published were in a marked degree monographic. 

 Instead of writing about many insects he selected a few and discussed 

 them thoroughly, working up as far as possible every detail in the life 

 history of the species studied. A striking feature of Professor Slinger- 

 land's bulletins is the excellence of the illustrations; he spared neither 

 time nor care in photographing entomological subjects, and acquired 

 a remarkable degree of skill in this field. 



Although his work is characterized by the highest degree of scientific 

 accuracy, he never forgot that the object of his work was to aid those who 

 till the soil. He never allowed his interests in the purely scientific aspects 

 of the subjects studied to cause him to neglect the practical applications 

 of the results obtained. A marked instance of this was his invention of 

 the Spray Calendar; for he devised the first tabular calendar arrangement 

 of spraying suggestions. This was printed and used at farmers' insti- 

 tutes in 1894. The value of this method of publication was apparent 

 at once and the method has been generally adopted by experiment stations. 



As a teacher Professor Slingerland was clear, direct, and painstaking. 

 He had the keenest interest in the needs of each individual student. In 

 the last conversation that the writer had with him, only a few hours before 

 his death, he discussed the work of several of his students. Even at that 

 hour, when it was evident to others that the end was near, his thought 

 was not of himself but of his students. 



In this manner closed the life of one who, although given but few years 

 in which to work, accomplished much; and who endeared himself to his 

 fellow workers by his sterling qualities as a man and a friend. 



J. H. Com stock 



