13 



Collops nigrice2)s, Conotrachelus leiicophcetus, Selandria ruhi, Lytta cinerea 

 and L. atrattJ, Haltica striolata, Eeliothls armifjera, Tnipanea aphidlvora, 

 Lema trilincata, aud two uudetermined species oi Erythroneura. 



BULLETIN NO. 7, APRIL, 1889. 



Introduction, C. L. Ingersoll, M. S. (p. 2). 



It has Ions beeu supposed tlicat the arid region presented such new and changed 

 conditions of soil and atmospheiv, that nearly all plants grown under these condi- 

 tions wonld change in one way or another Croni their normal condition as grown iu 

 Eastern States in dillerent latitudes. This has been found to be true of the wheat 

 plant, and to some extent the other cereals. The Experiment Station of Colorado 

 has undertaken the examination of other plants. It has carried on the work begun 

 two years ago in potatoes, and added the chemical analysis of three hundred and three 

 varieties for the content of starch, in order that some general comparison could be 

 made with Eastern and Southern grown varieties. Within a few years Colorado 

 potatoes have become well known for their elegant table quality. It is the aim of this 

 Station to grow, comparatively, many varieties, and to originate from seed new ones, 

 in order to improve upon these we now have, if possible to do so. The work has beeu 

 well done, and we hope will meet the needs of the State. The investigation of the 

 sugar-producing problem is important, and will be continued. 



Potatoes and sugar beets, James Cassidy, B. S., and D. 

 O'Brine, D. Sc. (pp. 3-23). 



Experiment with potatoes (pp. 3-21). — This was an experiment on half 

 an acre of clay loam soil, in two plats of one-fourth of an acre each, to 

 test named and seedling varieties of potatoes, aud the planting of one- 

 eye sets as compared with whole tubers. One-eye sets of the named 

 varieties aud medium-sized whole tubers of the seedlings were used. 

 The latter appeared above grouiul live days earlier thau the former 

 and, in agreement with previous experience, gave the largest yield and 

 the most vigorous development of tops. The yield was very light, owing 

 to the heat and dry weather of July and August. The seedling varieties 

 used were the best of over two thousand kinds raised at the Station 

 during the past three years. Some of them in other hands and in pecu- 

 liarly favorable soils gave better results the past season than did standard 

 varieties grown under the same conditions. Most of the named kinds 

 had not been tried here before. This test was chiefly valuable as show- 

 ing what varieties do best under adverse conditions. Tables give the 

 number of hills planted, the yield in pounds, the per cent of starch, the 

 condition of the tubers April 1 iu regard to sprouting, and notes on the 

 shape and appearance of the tubers, for one hundred and twenty-six 

 named and ninety-four seedling varieties. The average per cent of 

 starch for the seedlings was 18.85 per cent; for the named kinds, 17,17 

 per cent. The most prolific among the named kinds were Stray Beaut}', 

 lied Elephant, Grange, Bliss's Triumph, Summit and Jordan's Russet, 

 iu the order named. 



Xotes on the determination of starch in potatoes. — This article contains 

 a description of Sachsse's method as used by the chemist for determin- 



