DISEASES OF PLANTS. 557 



A species of Aschersonia, probably the same as the, above, is reported 

 as parasitic on Lecanium sp. on the sweet bay tree. Whether this 

 fungus can be spread rapidly enough to materially check the ravages 

 of the insects remains for further inquiry. 



An improved method ofmaJcing Bordeaux mixture, W. T. Sivingle (pp. 

 365--371). — Stock solutions, 2 lbs. of copper sulphate and milk of lime 

 to the gallon are recommended. These may be sufficiently diluted and 

 mixed. When mixed the solution should not be allowed to stand long 

 before using, as it deteriorates rapidly. When properly prepared Bor- 

 deaux mixture should be a clear sky blue in color. Such a mixture is 

 alkaline, and a thin pellicle of calcium carbonate will form over the 

 surface upon exposure to the air. Adding soap aids in causing the 

 mixture to spread. For this purpose some of the cheaper soaps 

 answer very well. The soap should be added in solution and in suffi- 

 cient quantity to foam when thoroughly stirred. 



A neic method of treating grain hythe Jensen procesfi for the prevention 

 of smut, B. T. Galloicay (pp. 372, 373). — The author describes a method 

 devised by Mr. E. Bartholomew for the hot- water treatment for oat 

 smut. It consists essentially in an open barrel arranged to draw off 

 the water near the bottom. Within the barrel a perforated cylinder is 

 so placed as not to reach the bottom of tlie barrel by 3 or 4 in., and 

 extending above the toj) about the same distance. A section of stove- 

 pipe will answer. Within the barrel and around the cylinder the oats 

 are placed, and water heated to ISC^ F. is poured into the cylinder until 

 all the oats are covered. After standing for 10 minutes the water is 

 drawn off below, heated again, and poured back. This is repeated 3 

 or 4 times. From such treated seed one-tenth of 1 per cent smutted 

 oats were obtained, as compared with 20 per cent from untreated seed. 



Field notes for 1892, E. F. Smith (pp. 373-377). — Brief notes are given 

 on a new melon disease due to an Alter naria or Maerosporium, on 

 perithecia of grape downy mildew found before frost, occurrence of 

 apple scab, pear blight, gooseberry-leaf blight, black si)ot of peach, 

 spot of peach probably due to Gercospora, peach mildew, peach curl, 

 wilting of peaches on the tree, stem and root galls, and root rot of the 

 peach due possibly to Armillaria mellea. 



Review of recent literature (pp. 378-398). — An injury of rose leaves 

 due to asphalt vapor, H. Alten and W. Januicke; Handbook of 

 Australian fungi, M. C. Cooke; A botanical excursion in the Tropics, 

 G. Haberlandt; A mosaic disease of tobacco, A. Mayer; On the dimor- 

 phism of the root tubercles of the pea, H. Moeller; Report on 

 recent experiments in checking the potato disease in the United King- 

 dom and abroad; Root symbiosis of Mycorrhizce, G. F. L. Sarauw; 

 Comparative morphology of fungi, F. von Tavel; and The diseases of 

 conifers, H. M. Ward. 



Errata (p. 399). — A list is given of corrections and additions to bo 

 made to the index of current literature. 



