[175 ] 14 ' 



CHAPTER IX. 



Page- 

 Of rearing Silkivorms in the fifth age, until they prepare to frrm their cocoon/s, - 90 



CHAPTER X. 



Of rearing Silkworms until the cocoon is perfected, - - - - 9T 



1. First preparation of the hedge, or espalier, - - - - 98 



2. Cleaning of the htirdles, and of the preparation for the rising of the 



silkworms, ........99 



3. Separation of the silkworms which will not rise? last cleaning of the 



hurdles, - - - - - - - - 102 



4. Care of the laboratory, until the silkworm has completed its fifth age, 102 



5. Quantity of vapor emitted by silkworms, - - - - 104- 



CHAPTER XI. 



Of the sixth age of Silkworms, or of the Chrysalis.- 



3. Gathering and preservation of the cocoons, . . . . lOj 

 2. Daily loss in weight of cocoons, ..... 108 



CHAPTER XII. 

 Birth and coupling of the moths.- laying of the eggs, and their preservation, - 108 



CHAPTER XIU. 



General view of all the facts stated in this work, immediately connected with the 

 art of cultivating Silkworms: 



1. Number of eggs of different varieties of silkworms to the ounce, - 113 



2. Space occupied by silkwonns, from one ounce of eggs, in different 



ages, - - - - - -J- - -113 



Quantities of leaves consumed by them in different ages, - - 114 

 . 3. Facts relative to the cocoons containing the healthy chrysalides; diseased 



and dead chrysalides, - - - - - - 114 



4. Facts relative to the production of eggs, .... 115 



5. Quantities of silk yielded by various parcels of cocoons, - - 116 



6. Weights of cocoons; produce of cocoons and of silk from an ounce of 



eggs, ..-..--- 117 



7. Proportion of eggs to cocoons, ..... 1I8 



8. Proportion of different quahties of cocoons, in various parcels, before 



and afer being baked, ...... 119 



Abstract and condensed view of the mode of rearing Silkworms, - - 120 



Means of producing early food for silkwoi-ms, and on tlie advantages of 



budding mulberry trees, ...... 125 



CHAPTER XIV. 



Diseases of Silkworms.- 



1. Diseases from defect of eggs, ------ 125 



2. " mismanagement of eggs, .... 126 



3. " bad air of the district in which silkworms are reared, - 126 



4. " impurity in the air of the laboratory, ... 127 



5. On purifying the air of a laboratory by acid fumigations, - - 127 



6. Of the Hygrometer, a simple one described, with a cut, - - 129 



7. Diseases from want of room for the worms, .... 130 



8. " quality .ind quantity of food, ... - 130 



9. " change of food, ..... 131 



10. " peculiar constitution of the air, - - 132 



11. " sudden changes of temperature, - - 133 



