August, '09] JOURNAL OP ECONOMIC ENTOMOLOGY 283 



amount of gas, but in this case the residue in the jar frequently con- 

 geals within 1 hour. It is stated however, that by using 3 parts of 

 water the residue in the jar seldom congeals. It was found also that 

 the greater the proportion of water used, (in addition to the maximum 

 mentioned above) the smaller the quantity of gas evolved, until with 

 8 parts of water to one each of acid and cyanide less than 50 per 

 cent, of the hydrocyanic acid passed off as gas. 



As there now seems to be some definite experimental data to sup- 

 port the 1-1-3 formula, there appears to be no valid reason for 

 not adopting it generally, and thus making the recommendation uni- 

 form. We prefer to state the formula in the order in which the 

 chemicals are added, hence the change in position in the following : 



Water 3 fluid oz. 



Commercial sulphuric acid (liigla grade 66 Beaume or 1.83 Sp. Gr.) . .1 fluid oz. 

 Fused potassium cyanide, 98% 1 oz. 



To each 100 cubic feet of air space in the fumigating room. 



The charge should remain in the room for one hour. 



NURSERY INSPECTION IN LOUISIANA 



By Arthur H. Rosenfeld, Assistant Entomologist, State Crop Pest Commission 

 of Louisiana, Baton Rotif/e 



Nursery conditions in the Pelican State might be described as both 

 temperate and semi-tropical in character. The nurseries in the north- 

 ern portion of the state grow such stock as apple, peach, plum, hardy 

 hedge and ornamental plants, etc., w'hile the majority of the nurs- 

 eries in southern Louisiana grow such plants as orange, lemon, kum- 

 quat, Ficus, cape jasmine, pecan, etc. The insects attacking these two 

 classes of nursery plants are quite distinct, but, as it is presumed that 

 this discussion was intended to bring out a comparison of the methods 

 in vogue in the various states, the writer will confine his description of 

 inspection methods to those nurseries in which deciduous stock is 

 grown. 



Our inspections in these nurseries are made for the usual insects 

 and plant diseases, with San Jose scale, of course, the principal bete 

 noire. On account of our long, hot summer, nursery inspection is not 

 begun until after July 1, as we have found that nurseries inspected 

 earlier than this and found apparently free of infestation may, by 

 September or October, show a comparatively heavy infestation. 



The regulations of the State Crop Pest Commission require the in- 

 spection, at least once each season, of all nurseries doing business in 



