ii8 THE TREE BOOK 



Florida, Chico, California, and Bellingham, 

 WasMngton. If a suspicious character arrives 

 at any of these stations, it is promptly ordered 

 to the quarantine station. This is the Yarrow 

 Gardens, near Rockville, Maryland. Some- 

 times the plant itself may have nothing to con- 

 demn it, but if it comes from certain danger 

 zones, off it goes to the quarantine. Here it is 

 held, often for weeks and months, until all pos- 

 sible danger of the development of disease is 

 past. In some instances, plants must have 

 passport certificates to leave their own land, 

 and they cannot enter here without a special 

 permit. 



Nursery stock of all kinds, fruits, seeds, and 

 foreign lint cotton are subject at all times to 

 the most rigid inspection. The cotton is fumi- 

 gated in a vacuum, so that there can be no pos- 

 sible chance of the pink boll-worm entering with 

 the cotton seeds. The "finds" which go to the 

 various stations, or gardens, are cared for and 

 studied for the purpose of learning their value. 

 If they seem at all promising, they are exten- 

 sively propagated and sent out to the state 

 experiment stations and to plant breeders 

 throughout the country. Often every resort of 

 the craft is necessary to save some plant immi- 

 grant which arrives out of season, or in a criti- 



