CONTENTS. 



CHAPTER I. 



Some Account of the Appearance of the Disease in different parts 

 of the World. 



Action of the British Government Report of the British Commission- 

 ers Proceedings of the French Academy of Arts and Sciences 

 Report of Professor Morren H. S. Thompson on the prevention of 

 curl and dry rot in potatoes experiments with ripe and unripe seed 

 Causes of the disease stated Conclusions of Mr. Thompson 

 Objections to his theory considered, 57 77 



CHAPTER II. 



A View of the different Theories entertained on tlie Potatoe Plague. 



First symptom of degeneracy of the plant in Scotland Diseased tu- 

 bers examined Seeds from an over-grown crop will always be a 

 diseased crop Remedy proposed Raising from the apple Dis- 

 ease supposed to be caused by rust European pamphlets on this 

 subject Result of chemical investigations Conversion of diseased 

 potatoes into starch Evil ascribed to too much moisture Fungi 

 analogous to smut in barley" Remedies against fungus Disease as- 

 cribed to various causes Professor Liebig's opinion Ascribed to 

 fungus in the leaf Spomles of fungi Experiments in planting dis- 

 eased potatoes Disease supposed to attack the stem primarily 

 On new high ground the crop less affected Opinion of J. E. Tes- 

 chemacher Salt a remedy Analysis of sea-weed A. B. Allen's 

 opinion Cause of fungi, and remedies proposed, . . . 76 94 



CHAPTER III. 



Cause of the Disease and Remedies stated. 



Review of the prevailing theories The disease exists in the potatoe 

 If fungi is the cause a certain remedy is at hand Causes of the 

 disease OVER RIPENING OVER CULTIVATION DETERIORA- 

 TION OF SEED CARELESSNESS IN SELECTING SEED Improper 

 management in taking up potatoes An improved method of plant- 

 ing Table Selecting potatoes for seed, .... 95116 



