50 
Mycologia 
Mr. W. M. Scott described and discussed a new fungicide which 
may replace lime-sulfur for spraying fruit trees. It is prepared 
by using barium instead of calcium in combination with sulfur, 
which permits the shipment of the fungicide in the dry state. 
This is much more convenient, while the price should be about 
the same and the results fully as beneficial. Lime-sulfur mixture 
is generally used now instead of Bordeaux for orchard work. 
The yellowish color is not objectionable to fruit trees but makes 
it impossible for parks. The new substance costs at present 4 
cents a pound. The dry crystalline substance consists of 85 per 
cent, of barium tetrasulfid and a small percentage of barium thio- 
sulfate and free sulfur. When this crystalline substance is dis- 
solved in cold water, preparatory to spraying, some of the free 
sulfur unites with the tetrasulfid, forming pentasulfid. It has 
has been determined that it is the polysulfid of barium rather than 
the thiosulfate or free sulfur that is beneficial. 
The last paper on the program was by Miss Caroline Rurhbold, 
showing some effects on chestnut trees- of the injection of chemi- 
cals. Tree injection is difficult because there is no blood in the 
tree to distribute the chemical, which is apt to go up and down 
in a restricted area. Openings were made on different side's of 
the tree trunks and fluids of various compositions and strength 
were injected through tubes clamped to the trunk. Analine 
stains were first used to determine the best methods of injection. 
No practical results with the chestnut canker were obtained, but 
it is hoped that some methods will be devised whereby valuable 
trees may be saved when attacked by diseases beneath the bark. 
W. A. Murrill. 
