By L. H. Bailey. Pp. 13. Illustrated. Professor Bailey's investigation upon the solubility of London purple as compared with Paris green shows that over 50 per cent. of the arsenic of London purple is quickly soluble in water, while Paris green contains no soluble arsenic. This discovery explains many of the instances where injury to foliage has followed the use of London purple, and emphasizes the importance of thorough investigations on the part of experiment stations before these institutions assume to give instruction to farmers and fruit growers.

Tested upon the susceptible foliage of the peach, London purple was found decidedly more injurious than Paris green. After these important results, it is a little surprising that Professor Bailey does "not discourage the general use of London purple."Those who have damaged the foliage of their apple and plum orchards by the use of this poison will hardly feel disposed to employ it further in the face of Professor Bailey's most satisfactory explanation of the injurious results.

Stocks for Plums.

Paris Green, London Purple and Peach Foliage.

The investigation was performed upon peach trees, and the following is the summary of it:

"1.Peach trees are very susceptible to injury from arsenical sprays.

"2. London purple is much more harmful to peach trees than Paris green, and it should never be used upon them in any manner.

"3. Injury is more liable to occur upon full-grown foliage and hardened shoots than upon young foliage and soft shoots.

"4. The immunity of the young growth is due to its waxy covering.

"5. Injury late in the season is more apparent than early in the season, because of the cessation of growth.

"6. Injury from the use of London purple may be permanent and irreparable.

"7. The length of time which the poison has been mixed appears to exercise no influence.

" 8. London purple contains much soluble arsenic (in our samples nearly 40 per cent.), and this arsenic is the cause of the injury to peach foliage.

"9. A coarse spray appears to be more injurious than a fine one.

"10. A rain following the application does not appear to augment the injury.

"ii. Meteorological conditions do not appear to influence results.

"12. Spraying the peach with water in a bright and hot day does not scorch the foliage.

"13. Paris green, in a fine spray, at the rate of one pound to 300 gallons of water, did not injure the trees. Probably one pound to 350 gallons is always safe".

The bulletin also gives the results of a trial of nozzles, and it concludes that for large trees, the nozzles known as "Gem," "Mystic" and "Boss" best answer the requirements. He also proposes an ingenious device for compressing the end of a hose, causing it to throw a thin stream, as a substitute for a metal nozzle. While I have not seen this apparatus tested, the question arose, if the continual holding of the cord by which the size of the opening at the end of the hose is adjusted would not become a serious annoyance. In my experi-ence with the Boss nozzle, I did not find it necessary to use a pole, but was able to spray the tallest apple trees satisfactorily while holding the nozzle in my hand.

Nozzles for Spraying.