160 
untreated portions of the same rows yielded a grand total of 2,771 po¬ 
tatoes, weighing 274 pounds 4 ounces, of which 948 were of marketable 
size and weighed 180 pounds 1 ounce. There was consequently a grand 
total increase in favor of the treated hills of 46 pounds 3 ounces total 
product, and 64 pounds 1 ounce marketable product. 
(7) This 61 pounds 1 ounce increase in marketable product was ob¬ 
tained from 250 feet of row (20 times 12J). This represents an increase 
of 4.1 ounces to the foot. As there are 14,560 feet of row in an acre of 
potatoes as ordinarily planted, an increase of 4.1 ounces to the foot 
amounts to 59,696 ounces, or 3,731 pounds to the acre. Eeduciug this 
to bushels by dividing by 60 (the number of pounds to the bushel) we 
get an increase from the treatment of 62.2 bushels to the acre. 
(8) There was in nearly every case a marked difference in the amount 
of scab on the treated and untreated tubers, the former being much 
more free from the disease, 
CONCLUSIONS. 
So far as a single experiment can be relied upon, the results here re¬ 
ported seem to indicate the correctness of the following provisional 
conclusions: 
(1) That a large proportion of the injury done by the potato rot can 
be prevented by spraying the vines with the Bordeaux mixture. 
(2) That this treatment apparently diminishes the amount of scab 
affecting the tubers. 
(3) That by adding London purple to the mixture, the same treat¬ 
ment may be made effective in preventing the injuries of both the rot 
and Colorado Potato Beetle. 
NEW EXSICCATI. 
By D. G. Fairchild. 
I. PARASITIC FUNGI OF CULTIVATED PLANTS. 
The second fasiele of Messrs. Briosi '& Cavara’s Parasitic Fungi of 
Cultivated Plants* has been received. The fascicle contains many in¬ 
teresting things, the following of which are of special importance to 
this country : 
Phytophtiiora inpestans, (Mont.) DBy., on Solatium li/copersicum. 
Plasmopara viticola, B. & C., on Yitis vinifera , 
Uromyces trifolii, Wint., on Trifoliumpratense. 
Puccinia gramixis, Pers., (I), oh Berberis vulgaris. 
Cercospora ros/ECOi.a, Pass., on Bosa, (cult.). 
Coxiotiiyrium diplqdiella, (Speg.) Sacc., on Vitis vinifera. 
COLLETOTRICHIUM LIXDEMUTKIAXUM, (S. & M.) B. & Cav., Oil Pka&eolUH 
vulgaris. 
* Funglii Parassiti Delle Piante Coltivate od Utili. 
