312 STATE BOARD OF AGRICULTURE. 



Second, If it ooiUaius arsenic in any of its combinations or in the 

 elemental form and tlie amount of arsenic in water-soluble forms (ex- 

 pressed as perceutum of metallic arsenic) is not stated on the label; 



Third, If it does not state plainly upon the label the correct names 

 and percentage amounts of each and every ingredient of the insecticide 

 or fungicide having insecticidal or fungicidal properties and the total 

 percentage of inert ingredients present. 



COLLECTION OF SAMPLES. 



Some of the samples analyzed were collected during the spring of 

 1014 and the remainder were collected during the spring of 11)1.5. 



No attempt has been made to secure samples of all insecticides and 

 fungicides sold in the State as the funds allowed for this work are not 

 sufficient to permit of a complete collection each year. In the future it 

 is i>lanned to center our attention on a different class of materials each 

 year and especially upon new preparations. In this way it will be pos- 

 sible to cover the entire field every two or three years. 



One hundred four samples of various materials have been examined 

 and the analyses will be found in the following pages. 



LIME-SULFUR SOLUTIONS. 



The principal ingredient of lime-sulfur solution is calcium sulfide 

 and it is possible for the compound to consist of one part of calcium to 

 2, 3, 4 or 5 parts of sulfur depending upon various factors. The usual 

 proportion of calcium to sulfur in commercial lime-sulfur solutions is 

 1 to 4-5. 



This combination is usually referred to as calcium poly-sulfide and, 

 according to an investigation conducted by Dr. Shafer of the Entomolog- 

 ical division of the Michigan Experiment Station, the insecticidal 

 and fungicidal properties of the solution are due to this compound. 

 Other compounds (calcium thiosulfate, calcium sulfite and calcium sul- 

 fate) are also formed in small quantities but, as they probably have 

 little or no insecticidal or fungicidal value are not included in the table. 



Samples 4818, 4821, 4822, 4825, 4826, 4827, 4833, 4837, were collected 

 in the spring of 1914, the remainder being 1915 stock. 



All of the samples analyzed were found to be above the standard guar- 

 anteed by the manufacturers. 



