YELLOW DISEASE OF HYACINTHS. 



341 



Double rose: 



Boquet royal o o 

 Boquet tendre + 

 Czar Nicholas o + 

 Dagmar + 

 Frederick the Great + 

 Globosa + 

 Grootvorst o 

 Leo + 



Le Grand Concurrent o 

 Princesse Alexandra o | 

 Princesse Louise + 

 Venus de Medici + 



Double white: 



Boquet Royal + 



Flevo 00 



Florence Nightingale + + 



Grand Vainqueur + + 



Jenny Lind + 



La Grande Duchesse + 



La Grandesse + + 



La Tour D'Auvergne + + + 



Princesse Metternich + 



Isabella o 



Fig. 133.* 



Double white continued: 

 La. Virginite o o 

 Prince of Waterloo + 

 Triumph Blondine o 



Double light blue: 



Madame Monmouth + 

 Rembrandt o 

 Van Speyck + 



Double dark blue: 



Crown Prince of Sweaen o o 

 Laurens Koster + 

 Lord Raglan o 

 Prince of Saxe Weimar O 



Double yellow and orange: 

 Boquet d 'Orange + 

 Minerva + 

 Sir Rowland Hill 

 Souvereign o + (by letter 

 Sunflower o 



Double violet: 

 La Victoire + 



From the third grower I received the following letter and supplementary list of varieties : 



I have much pleasure in handing you a catalogue in which, according to your suggestion, are 

 marked the hyacinths which are much subject to the yellow disease and such which are very resistant. 

 It must, however, be understood that similar statements have only relative value. Many varieties 

 which used to be among the best trade-sorts a few years ago, have now entirely disappeared in con- 

 sequence of the yellow disease and it may be expected that the list of varieties after ten years will be 

 very much reduced. 



The following list of hyacinth varieties shows those which have entirely or nearly dis- 

 appeared in consequence of the yellow disease : 



Single red and rose: 

 Emilius 



Ornement de la Nature 

 Mrs. Beecher Stowe 

 Unica spectabilis 

 Duchesse de Richmond 

 Mars 



Lord Grey 

 Lord Percy 



Single white : 



Madame de Stael 

 Queen Victoria 

 Miss Nightingale 



Single blue: 

 Orondates 

 Emilius 



Prinz Albert von Preussen 

 Nimrod 

 Siam 



Grand Vainqueur 

 Argus 



De Candolle 

 Porseleinen Scepter 

 Priestley 

 Ferruck Khan 

 von Schiller 

 Clio 



Single blue continued : 

 King of the Blacks 

 The Sultan 



Single yellow: 

 La Pluie d'Or 

 Overwinnaar 

 La Citroniere 



Single violet: 

 Haydn 

 Jesko 

 Sir Henry Havelock 



Double red: 

 Regina Victoria 



Double white: 

 Anna Maria 

 van Hoboken 

 Mont St. Bernard 

 Emperor of the double Whites 



Double blue: 

 Louis Philippe 

 Lord Raglan 

 Frans Hals 

 Duke of Norfolk 



Double yellow: 

 Jaune supreme 



*FiG. 133. Detail from a cavity made by Bad. hyacinthi in a bulb-scale of hyacinth showing separated and crushed 

 cells lying in a mass of bacteria cavity like that shown in fig. 132, but larger. Slide 507 B 6, third section fromright. 

 Material collected by the writer at Haarlem in 1906. Gram's stain modified by substitution of amylic alcohol for 

 ethyl alcohol. Starch grains on bottom at right. 



