Conspiracies of agents with third persons, §10-6-59. Credit to agent. Effect of seller giving, §10-6-55. Dealing with special agents, §10-6-50. Defenses against undisclosed principal, §10-6-62. Effect of private instructions, §10-6-50. Form in which agent acts. Immaterial, §10-6-53. Fraud of agents, §10-6-60. Illegally paid money, §10-6-63. Immateriality of form in which agent acts, §10-6-53. Liability on contract of undisclosed principal, §10-6-54. Mistakenly paid money, §10-6-63. Neglect of agents, §10-6-60. Notice to agent is notice to principal,