(CORNELL UNIVERSITY EXPERIMENT STATION BUL.LETINS. 323 



feet of space in the box or tent one ounce of fused cyanide of potassium 

 (58 per cent.), one fluid ounce of sulphuric acid, and two fluid ounces of 

 water are used. The cyanide of potassium is placed in an earthenware 

 vessel, the water poured over it, the sulphuric acid then added, and the 

 box or tent closed tightly immediately and kept closed for at least forty 

 minutes. 



Every peach-grower should take sufficient interest in the welfare of his 

 own orchard and that of his neighbor to treat in one of the above ways all 

 peach stocks purchased in localities where the pest is known to be present, 

 as in New Jersey, Delaware, Maryland, or Virginia. If this be thoroughly 

 done our peach orchards will have one less serious insect foe to fear. And 

 the growing nursery industry of New York state, which now has nearly 

 500 acres devoted to peaches, constituting nearly 15 per cent, of all the 

 peach stocks grown in the United States, will not suffer as it would were 

 it known that this pest is liable to accompany the trees sent out. 



MARK VERNON SLINGERLAND. 



THE BEHAVIOR OP SOME EGG-PLANT CROSSES. 



In 1889, three crosses were made among egg-plants, one cross being 

 between Round White and Black Pekin, one between Giant Round Purple 

 and White Chinese, and the other between Long White and Black Pekin. 

 In every case, the parents were very unlike, both in shape and color of 

 fruit, and in color of plant. A number of plants were grown from these 

 seeds in 1890, and the characters of the resulting offspring were fully 

 explained and figured in Bulletin 26, March, 1891. The present report 

 deals with the second generation, grown in 1891. 



The cross which we called A was made between Round White and Black 

 Pekin. The Round White is a small green plant which bears small 

 oblong, clear white hard fruits. The Black Pekin is a large, dark purple 

 plant which produces very large, nearly globular and very dark purple 

 fruits. One fruit was obtained in 1889 as a result of crossing these two 

 varieties. The seeds of this fruit gave in 1890 a, series of plants which 

 were almost exactly intermediate between the parents in size and other 

 characters. The young shoots were much like the pistillate parent — Round 

 White — but as they became older, the upper surface of the stems, the 

 petioles, and the veins of the leaves assumed the purple tinge of the male 

 parent. In form and size, the larger part of the fruits seemed to vary in 

 the direction of the pistillate parent, many of them being decidedly ovoid 

 in form and very small. A few were larger, and had somewhat the form 

 of thestaminate parent. Frequently the same plant would produce mature 

 fruits two inches and others five inches in diameter. In color the fruits 

 were purple while young, — first month or so, — usually dark purple with 

 lighter apex. In some instances this color was retained till time of edible 

 maturity; but as a rule, the dark purple changed to a dull greenish hue, 

 and the light apex became metallic gray with a faint tinge of purple, and 

 streaks of grayish-purple extended toward the base. The accompanying 

 figure shows the extent of variation in 1890, or a fruit of every type 

 obtained. 



From the first brood of this cross, 1890, eight fruits were selected or 

 again crossed, as parents for succeeding crops. These fruits were essen- 



