DRESSINGS FOR WOUNDS 



157 



.asphaltum, creosote, tar and carbolineum, as recom- 

 mended by Selby (132, 135) and Cook (134). 



Wherever a dressing is used it may be made less con- 

 spicuous by adding some pigment to change the color. 

 For instance, white lead paint may be turned to a bark- 

 colored gray w r ith a little raw sienna, and cement may be 

 similarly treated with asphaltum. 



FIG. 116 TYPES OF HAND SAWS FOR TREE PRUNING 



Nos. 1 and 2. Good examples of the swivel blade type. Good grips. Make 

 trood cuts in any position and are not expensive. This type once used is always 

 used. No. 2 has loose pins in the blade. These are often lost when the tension 

 is slackened. No. 4. Common type, with fine teeth toward the tapered point for 

 yse in narrow quarters. The handle is small for the gloved hand. Does fairly good 

 work and is inexpensive. 



131. Experiments in wound healing.* Experiments in wound heal- 

 ing were made in Nebraska with six treatments liquid grafting 

 wax, shellac varnish, white lead paint, pine tar and coal tar and no 

 treatment. "Wax is the only application which appears to possess 

 any advantage in aiding the wound to heal, though most of them 

 did not hinder the process. . . .Those treated with shellac did not 

 I in June] seem to have healed quite as well as those left untreated 

 I but in September there seemed to be] a slight difference in favor 

 of shellac over those untreated. Paint does not hinder the process 



* Epitomized from Nebraska Bulletin 50, Page 8. 



